This application note provides a power supply example for the system designer, which takes advantage of the
power saving features built in to the LPC32X0 microcontroller.
In today’s complex embedded microcontroller designs not all peripheral interfaces and
memories operate over the same power supply voltage range. For this reason and for
overall system power savings, there is a need to provide system designers with the
flexibility to support a wide range of IO voltage levels. For example, a low power
application may use mobile SDR or DDR synchronous dynamic memories requiring 1.8V
power while many other peripheral interfaces may require 2.8 - 3.3 volts, while a battery
backed RTC may require yet another voltage. The LPC32X0 provides flexible power
domains for these situations in the following ways:
1. The LPC32X0 IO buffers operate over the voltage range between 1.7 to 3.6 volts.
2. The External Memory Controller pins are on an independent IO power domain.
3. Peripheral, RTC and Analog pins are distributed across independent power domains.